A student uses a convex lens to form an image of a candle on a screen. The object is placed 18 cm from the lens, and the image is formed 36 cm from the lens on the other side. What is the focal length of the lens? Use: 1/v – 1/u = 1/f, all distances from lens, and round to the nearest whole number.
How many questions are in this set?
This practice set contains 20 questions.
Is this an official exam paper?
These are practice questions, not an official past paper.